Measuring With The Benning Cm; Preparing The Measurement; Voltage Measurement - Benning CM 9-1 Bedienungsanleitung

E11 External low-frequency magnetic field
(15 Hz to 400 Hz acc. to IEC 61000-4-8)
E12 Load current when using the differential
current method
E13 Contact current caused by common-mode
rejection
E14 Frequency
E15 Repeatability
Intrinsic uncertainty (A)
Operating uncertainty (B)
Measured value 3.5 mA
Measured value >10 mA
8.

Measuring with the BENNING CM 9-1

8.1 Preparing the measurement

Operate and store the BENNING CM 9-1 at the specified storage and operating
temperatures only! Do not permanently expose the device to sunlight.
- Check rated voltage and rated current details specified on the safety mea-
suring leads. The nominal voltage and current ratings of the safety measur-
ing leads included in the scope of delivery correspond to the ratings of the
BENNING CM 9-1.
- Check the insulation of the safety measuring leads. If the insulation is dam-
aged, the BENNING CM 9-1 must be scrapped immediately.
- Check the continuity of the safety measuring leads. If the leads are discon-
nected at any point, remove it immediately.
- Before at the rotary switch 5 a different function is selected, the safety mea-
suring leads must be disconnected from the measuring point.
- Strong sources of interference in the vicinity of the BENNING CM 9-1 might
involve unstable readings and measuring errors.

8.2 Voltage measurement

Do not exceed the maximum permitted voltage with respect to
earth potential!
Please observe the overvoltage category of the electric circuit!

Attach the protective caps (CAT III/IV) to the contact tips be-
fore making measurements in circuits of overvoltage category
CAT III or IV.
Electrical danger!
The maximum voltage which may be applied to the sockets
- COM socket, black J ,
- V -Ω socket (positive) K for voltage and resistance measurements and con-
tinuity testing (marked red)
of the BENNING CM 9-1 against ground, amounts to 300 V CAT IV/ 600 V CAT
III.
- Use the rotary switch 5 to select the required function V
BENNING CM 9-1.
- The black safety measuring lead has to be contacted with the COM jack J
on the BENNING CM 9-1.
- Connect the red safety measuring lead to the V-Ω jack K , marked in red.
- Bring the safety measuring leads into contact with the measuring points,
read off measured value on the digital display 9 on the BENNING CM 9-1.
Note:
- In small voltage measuring ranges, the zero-volt indication does not appear
(due to interference) when the safety measuring leads are open. Make sure
that the BENNING CM 9-1 is fully functional by short-circuiting the measur-
ing tips.
See figure 2:
See figure 3:
10/ 2019
DC voltage measurement
AC voltage measurement
BENNING CM 9-1
± 10 µA per 1 µT (magnetic field)
± 6 µA per 1 A load current additionally
-
-
-
see measuring accuracy, sections 7.1 to 7.4
10 A/ m
< 15 %
< 10 %

30 A/ m
< 20 %
< 12,5 %
or V  on the
15